Axis 2 on Input Manager? (possible bug)

While mapping out the buttons on my Joysticks (Gamecube controller through USB adapter) I've come across a problem.

Horizontal axis of the main control stick is axis 0, vertical is axis 1

The gamecube c-stick vertical axis is axis 2

HOWEVER, when I go to the input manager, the axes are Labeled X, Y, then axis 3.... there's no axis 2... Axis X and Y correspond to axis 0 and 1, and I can't figure out a way to set axis 2...